Fix -MaximumRetryCount description in Invoke-WebRequest.md

Author: igoragoli

reference/7.4/Microsoft.PowerShell.Utility/Invoke-WebRequest.md

@@ -829,7 +829,7 @@ Accept wildcard characters: False
 ### -MaximumRetryCount
 
 Specifies how many times PowerShell retries a connection when a failure code between 400 and 599,
-inclusive or 304 is received. Also see **RetryIntervalSec** parameter for specifying number of
+inclusive or 304 is received. Also see **RetryIntervalSec** parameter for specifying the interval between
 retries.
 
 ```yaml